JBL SDP-3 Installation & Technical Manual

Also see for SDP-3: Quick reference guide

JBL SynthesisSystemConfiguration24CenterSystems that utilize a full-range center speaker should select LARGE todirect center information to the center output with a full frequencyresponse. Select SMALL for installations where the center speaker issmaller than the left and right front speakers. This will automaticallyengage the Bass Split feature, which takes the low frequency contentfrom the center and distributes it to the left and right front speakers,reducing the risk of damage to a small center speaker without loss ofbass information. When SMALL is highlighted, press SELECT to displayand adjust the crossover point for the low frequency redistribution.Available crossover points are: 40, 80 and 120Hz. Press DONE to returnto the Speaker Configuration menu. This setting should be on SMALLat 80Hz for ALL JBL Synthesis systems.SidesThis menu sets the system for your particular side speaker configura-tion. Systems with side speakers should be designated as STANDARD(LARGE or SMALL) or DIPOLE (LARGE or SMALL). DIPOLE indicatesa THX speaker configuration, and will work best for dipoles, whether ornot speakers are used. When STANDARD SMALL or DIPOLE SMALLis highlighted, press SELECT to display and adjust the highpass filter forthe side outputs. Choices are 40, 80 or 120Hz. For any 5.1 channelinputs, selecting SMALL routes the low frequency information to thesubwoofer output. Selecting NONE mutes the side outputs and directsall surround information to the rear outputs. This setting should be onDIPOLE SMALL at 80Hz for ALL JBL Synthesis systems.RearsThe active selections are LARGE and SMALL. Systems that utilize full-range rear speakers should select LARGE to direct a full-range signalto them. SMALL should be selected when filtering is desired. (40, 80 and120Hz are available as settings for the -3dB point). For any 5.1 channelinputs, selecting SMALL routes the low frequency information to thesubwoofer output. Selecting NONE mutes the rear outputs and directsall surround information to the side outputs. When used with JBLSynthesis systems using side and rear speakers, this setting should beon SMALL at 80Hz. Otherwise, NONE should be selected.10 1005020 2k1k500200 5k 10kdBrHz0.0-1.000-2.000-3.000-4.000-5.000-6.000-7.000-8.000-9.000-10.00-11.00-12.00-13.00-14.00-15.00-16.00-17.00-18.00Bass Split rolls off frequencies at 12dB peroctave. The values given are at the -3dB pointof attenuation from the center speaker.